Strap for Conquest Chronograph

The Longines Conquest L3.678.4.56.6 features a 21mm lug width. This is a model-specific dimension—not a standard size—and requires careful sourcing of compatible straps. To verify this measurement on your watch, position a ruler at the inner shoulders of the case lugs and measure the distance between the attachment points.

The choice depends on usage and aesthetic preference. To enhance the elegant character, alligator in dark tones (black, chocolate brown, burgundy) creates maximum contrast with the panda dial. For everyday versatility, superior-quality calf leather with vegetable tanning offers comfort and natural patina development over time. Those prioritising the sports character prefer a robust NATO or structured rubber that emphasises the chronograph.

The Longines Conquest uses standard quick-release spring bars. Proceed as follows: place the watch on a soft, stable surface. Locate the spring bars—small metal levers hidden at the lug shoulders—and press inward with a dedicated tool (spring bar tool). The bar retracts, freeing the lug. Remove the old strap and insert the new one, ensuring the width is exactly 21mm to avoid damaging the case attachments.

Yes, provided the lug width is precisely 21mm and construction quality is adequate. Artisanal aftermarket straps of superior quality—such as those in alligator or shell cordovan—are not only compatible but often transform the watch's aesthetic character, offering customisation options that factory Longines straps do not permit.

A quality leather strap—alligator, calf, shell cordovan—maintains structural integrity for three to five years of daily wear, provided proper maintenance. Primary wear concerns the buckle, which may deteriorate before the leather itself. Exceptional leathers such as shell cordovan can exceed this duration. The patina that develops over time is a sign of natural ageing and increases the watch's aesthetic value.